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Why do 2-stroke engines burn more oil?
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)
Announcing the arrival of Valued Associate #679: Cesar Manara
Unicorn Meta Zoo #1: Why another podcast?How is fuel mixed with air in a jet engine?How is oil supplied in chainsaws?How efficient is the opposed cylinder combustion engine design?Why is “regular” gasoline standard instead of something more knock-resistant?Is it a good idea to start any engine once in a while?Engine capacity and number of cylindersHow much air will an engine use per tank of gas?Efficiency and NOx emission of lean burn gas enginesWhy not drive an air source heat pump domestic heating system with an auto engine?4-stroke vs. 2-stroke rpm
$begingroup$
Of course, most 2-stroke engines require oil to be mixed with the fuel (I appreciate there are 2-stroke engines that don't require this). Therefore, it makes sense to me that oil will be burnt during the combustion process, given it is mixed with the fuel.
However, what doesn't make sense to me is why 4-stroke engines don't burn just as much oil. In both engines, my understanding is that the oil has to be used within the cylinders to keep them from seizing, so surely a 4-stroke engine would also be burning oil too, with the oil just being added at a different stage?
I would like to understand why 2-stroke engines burn more oil than 4-stroke engines?
mechanical-engineering automotive-engineering mechanical
edited 2 days ago
Kevin Reid
1457
asked Apr 13 at 12:27
PhysicsGuy123PhysicsGuy123
203
New contributor
PhysicsGuy123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
$begingroup$
Of course, most 2-stroke engines require oil to be mixed with the fuel (I appreciate there are 2-stroke engines that don't require this). Therefore, it makes sense to me that oil will be burnt during the combustion process, given it is mixed with the fuel.
However, what doesn't make sense to me is why 4-stroke engines don't burn just as much oil. In both engines, my understanding is that the oil has to be used within the cylinders to keep them from seizing, so surely a 4-stroke engine would also be burning oil too, with the oil just being added at a different stage?
I would like to understand why 2-stroke engines burn more oil than 4-stroke engines?
mechanical-engineering automotive-engineering mechanical
edited 2 days ago
Kevin Reid
1457
asked Apr 13 at 12:27
PhysicsGuy123PhysicsGuy123
203
New contributor
PhysicsGuy123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
$begingroup$
An equivalent question might be to note that both engines need oil for lubrication but get it by different methods and then ask why the 2-stroke needs to have so much more oil added to the fuel than would normally be consumed by a 4-stroke. I.e. what would go wrong if only half the recommended amount of oil were mixed with the fuel?
$endgroup$
– Ray Butterworth
Apr 13 at 12:50
add a comment |
$begingroup$
Of course, most 2-stroke engines require oil to be mixed with the fuel (I appreciate there are 2-stroke engines that don't require this). Therefore, it makes sense to me that oil will be burnt during the combustion process, given it is mixed with the fuel.
However, what doesn't make sense to me is why 4-stroke engines don't burn just as much oil. In both engines, my understanding is that the oil has to be used within the cylinders to keep them from seizing, so surely a 4-stroke engine would also be burning oil too, with the oil just being added at a different stage?
I would like to understand why 2-stroke engines burn more oil than 4-stroke engines?
mechanical-engineering automotive-engineering mechanical
edited 2 days ago
Kevin Reid
1457
asked Apr 13 at 12:27
PhysicsGuy123PhysicsGuy123
203
New contributor
PhysicsGuy123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
Of course, most 2-stroke engines require oil to be mixed with the fuel (I appreciate there are 2-stroke engines that don't require this). Therefore, it makes sense to me that oil will be burnt during the combustion process, given it is mixed with the fuel.
However, what doesn't make sense to me is why 4-stroke engines don't burn just as much oil. In both engines, my understanding is that the oil has to be used within the cylinders to keep them from seizing, so surely a 4-stroke engine would also be burning oil too, with the oil just being added at a different stage?
I would like to understand why 2-stroke engines burn more oil than 4-stroke engines?
mechanical-engineering automotive-engineering mechanical
mechanical-engineering automotive-engineering mechanical
edited 2 days ago
Kevin Reid
1457
asked Apr 13 at 12:27
PhysicsGuy123PhysicsGuy123
203
New contributor
PhysicsGuy123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 2 days ago
Kevin Reid
1457
asked Apr 13 at 12:27
PhysicsGuy123PhysicsGuy123
203
New contributor
PhysicsGuy123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 2 days ago
Kevin Reid
1457
edited 2 days ago
Kevin Reid
1457
edited 2 days ago
Kevin Reid
1457
1457
asked Apr 13 at 12:27
PhysicsGuy123PhysicsGuy123
203
New contributor
PhysicsGuy123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Apr 13 at 12:27
PhysicsGuy123PhysicsGuy123
203
asked Apr 13 at 12:27
PhysicsGuy123PhysicsGuy123
203
203
New contributor
PhysicsGuy123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
PhysicsGuy123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
PhysicsGuy123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$begingroup$
An equivalent question might be to note that both engines need oil for lubrication but get it by different methods and then ask why the 2-stroke needs to have so much more oil added to the fuel than would normally be consumed by a 4-stroke. I.e. what would go wrong if only half the recommended amount of oil were mixed with the fuel?
$endgroup$
– Ray Butterworth
Apr 13 at 12:50
add a comment |
$begingroup$
An equivalent question might be to note that both engines need oil for lubrication but get it by different methods and then ask why the 2-stroke needs to have so much more oil added to the fuel than would normally be consumed by a 4-stroke. I.e. what would go wrong if only half the recommended amount of oil were mixed with the fuel?
$endgroup$
– Ray Butterworth
Apr 13 at 12:50
$begingroup$
An equivalent question might be to note that both engines need oil for lubrication but get it by different methods and then ask why the 2-stroke needs to have so much more oil added to the fuel than would normally be consumed by a 4-stroke. I.e. what would go wrong if only half the recommended amount of oil were mixed with the fuel?
$endgroup$
– Ray Butterworth
Apr 13 at 12:50
$begingroup$
An equivalent question might be to note that both engines need oil for lubrication but get it by different methods and then ask why the 2-stroke needs to have so much more oil added to the fuel than would normally be consumed by a 4-stroke. I.e. what would go wrong if only half the recommended amount of oil were mixed with the fuel?
$endgroup$
– Ray Butterworth
Apr 13 at 12:50
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
In both engines, my understanding is that the oil has to be used within the cylinders to keep them from seizing, so surely a 4-stroke engine would also be burning oil too, with the oil just being added at a different stage?
Oil is not added because piston rings separate it from fuel. Rings keep the oil at one side of the piston (the crankcase side) and the burning fuel-air mixture at the piston head side. Ideally, the oil is not supposed to get to the head side at all: no mixing and no burning.
Of course, some is oil is left on the inner cylinder wall in the form of a film, some of it get washed away by fuel and burned by the combusting mix. But this amount is much, much smaller than the amount of oil that has to be mixed into fuel in cheap 2-stroke engines. While the mixed-in oil passes through the crankcase just once yet it still has to provide similar level of lubrication as the oil that's (almost) permanently contained in the oil pan of a 4-stroke engine (or a proper2-stroke engine with a dedicated scavenging blower, as you've mentioned).
Basically: 4-stroke keeps reusing oil and loses only as much oil as slips past piston rings. 2-stroke uses oil once and throws it overboard. That's why so much more oil is necessary when it's mixed into fuel.
edited 2 days ago
PhysicsGuy123
203
answered Apr 13 at 19:29
Agent_LAgent_L
38616
$endgroup$
add a comment |
$begingroup$
Simply because many small 2 strokes use the oil / fuel mix as the lubrication system as the lubrication occurs as the mix passes through the crankcase on its way to the combustion chamber.
A four stroke, and some 2 strokes, have a dedicated oil lubrication system with an oil reservoir, often in the sump, so the oil is not consumed with the fuel.
4 strokes do have a small amount of oil left on the bore as the piston descends because the scraper ring is not perfect while it does remove most of the oil film... But this is a really tiny amount.
answered Apr 13 at 13:41
Solar MikeSolar Mike
5,5861714
$endgroup$
$begingroup$
Thanks for your answer. One question I do have is how the piston's movement within the cylinder is lubricated in a 4-stroke engine without oil being on the cylinder walls while combustion occurs?
$endgroup$
– PhysicsGuy123
Apr 13 at 14:14
$begingroup$
Only the rings are in contact with the walls.. and as mentioned there is an oil film...
$endgroup$
– Solar Mike
Apr 13 at 15:15
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
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active
oldest
votes
$begingroup$
In both engines, my understanding is that the oil has to be used within the cylinders to keep them from seizing, so surely a 4-stroke engine would also be burning oil too, with the oil just being added at a different stage?
Oil is not added because piston rings separate it from fuel. Rings keep the oil at one side of the piston (the crankcase side) and the burning fuel-air mixture at the piston head side. Ideally, the oil is not supposed to get to the head side at all: no mixing and no burning.
Of course, some is oil is left on the inner cylinder wall in the form of a film, some of it get washed away by fuel and burned by the combusting mix. But this amount is much, much smaller than the amount of oil that has to be mixed into fuel in cheap 2-stroke engines. While the mixed-in oil passes through the crankcase just once yet it still has to provide similar level of lubrication as the oil that's (almost) permanently contained in the oil pan of a 4-stroke engine (or a proper2-stroke engine with a dedicated scavenging blower, as you've mentioned).
Basically: 4-stroke keeps reusing oil and loses only as much oil as slips past piston rings. 2-stroke uses oil once and throws it overboard. That's why so much more oil is necessary when it's mixed into fuel.
edited 2 days ago
PhysicsGuy123
203
answered Apr 13 at 19:29
Agent_LAgent_L
38616
$endgroup$
add a comment |
$begingroup$
In both engines, my understanding is that the oil has to be used within the cylinders to keep them from seizing, so surely a 4-stroke engine would also be burning oil too, with the oil just being added at a different stage?
Oil is not added because piston rings separate it from fuel. Rings keep the oil at one side of the piston (the crankcase side) and the burning fuel-air mixture at the piston head side. Ideally, the oil is not supposed to get to the head side at all: no mixing and no burning.
Of course, some is oil is left on the inner cylinder wall in the form of a film, some of it get washed away by fuel and burned by the combusting mix. But this amount is much, much smaller than the amount of oil that has to be mixed into fuel in cheap 2-stroke engines. While the mixed-in oil passes through the crankcase just once yet it still has to provide similar level of lubrication as the oil that's (almost) permanently contained in the oil pan of a 4-stroke engine (or a proper2-stroke engine with a dedicated scavenging blower, as you've mentioned).
Basically: 4-stroke keeps reusing oil and loses only as much oil as slips past piston rings. 2-stroke uses oil once and throws it overboard. That's why so much more oil is necessary when it's mixed into fuel.
edited 2 days ago
PhysicsGuy123
203
answered Apr 13 at 19:29
Agent_LAgent_L
38616
$endgroup$
add a comment |
$begingroup$
In both engines, my understanding is that the oil has to be used within the cylinders to keep them from seizing, so surely a 4-stroke engine would also be burning oil too, with the oil just being added at a different stage?
Oil is not added because piston rings separate it from fuel. Rings keep the oil at one side of the piston (the crankcase side) and the burning fuel-air mixture at the piston head side. Ideally, the oil is not supposed to get to the head side at all: no mixing and no burning.
Of course, some is oil is left on the inner cylinder wall in the form of a film, some of it get washed away by fuel and burned by the combusting mix. But this amount is much, much smaller than the amount of oil that has to be mixed into fuel in cheap 2-stroke engines. While the mixed-in oil passes through the crankcase just once yet it still has to provide similar level of lubrication as the oil that's (almost) permanently contained in the oil pan of a 4-stroke engine (or a proper2-stroke engine with a dedicated scavenging blower, as you've mentioned).
Basically: 4-stroke keeps reusing oil and loses only as much oil as slips past piston rings. 2-stroke uses oil once and throws it overboard. That's why so much more oil is necessary when it's mixed into fuel.
edited 2 days ago
PhysicsGuy123
203
answered Apr 13 at 19:29
Agent_LAgent_L
38616
$endgroup$
In both engines, my understanding is that the oil has to be used within the cylinders to keep them from seizing, so surely a 4-stroke engine would also be burning oil too, with the oil just being added at a different stage?
Oil is not added because piston rings separate it from fuel. Rings keep the oil at one side of the piston (the crankcase side) and the burning fuel-air mixture at the piston head side. Ideally, the oil is not supposed to get to the head side at all: no mixing and no burning.
Of course, some is oil is left on the inner cylinder wall in the form of a film, some of it get washed away by fuel and burned by the combusting mix. But this amount is much, much smaller than the amount of oil that has to be mixed into fuel in cheap 2-stroke engines. While the mixed-in oil passes through the crankcase just once yet it still has to provide similar level of lubrication as the oil that's (almost) permanently contained in the oil pan of a 4-stroke engine (or a proper2-stroke engine with a dedicated scavenging blower, as you've mentioned).
Basically: 4-stroke keeps reusing oil and loses only as much oil as slips past piston rings. 2-stroke uses oil once and throws it overboard. That's why so much more oil is necessary when it's mixed into fuel.
edited 2 days ago
PhysicsGuy123
203
answered Apr 13 at 19:29
Agent_LAgent_L
38616
edited 2 days ago
PhysicsGuy123
203
edited 2 days ago
PhysicsGuy123
203
edited 2 days ago
PhysicsGuy123
203
203
answered Apr 13 at 19:29
Agent_LAgent_L
38616
answered Apr 13 at 19:29
Agent_LAgent_L
38616
answered Apr 13 at 19:29
Agent_LAgent_L
38616
38616
add a comment |
add a comment |
$begingroup$
Simply because many small 2 strokes use the oil / fuel mix as the lubrication system as the lubrication occurs as the mix passes through the crankcase on its way to the combustion chamber.
A four stroke, and some 2 strokes, have a dedicated oil lubrication system with an oil reservoir, often in the sump, so the oil is not consumed with the fuel.
4 strokes do have a small amount of oil left on the bore as the piston descends because the scraper ring is not perfect while it does remove most of the oil film... But this is a really tiny amount.
answered Apr 13 at 13:41
Solar MikeSolar Mike
5,5861714
$endgroup$
$begingroup$
Thanks for your answer. One question I do have is how the piston's movement within the cylinder is lubricated in a 4-stroke engine without oil being on the cylinder walls while combustion occurs?
$endgroup$
– PhysicsGuy123
Apr 13 at 14:14
$begingroup$
Only the rings are in contact with the walls.. and as mentioned there is an oil film...
$endgroup$
– Solar Mike
Apr 13 at 15:15
add a comment |
$begingroup$
Simply because many small 2 strokes use the oil / fuel mix as the lubrication system as the lubrication occurs as the mix passes through the crankcase on its way to the combustion chamber.
A four stroke, and some 2 strokes, have a dedicated oil lubrication system with an oil reservoir, often in the sump, so the oil is not consumed with the fuel.
4 strokes do have a small amount of oil left on the bore as the piston descends because the scraper ring is not perfect while it does remove most of the oil film... But this is a really tiny amount.
answered Apr 13 at 13:41
Solar MikeSolar Mike
5,5861714
$endgroup$
$begingroup$
Thanks for your answer. One question I do have is how the piston's movement within the cylinder is lubricated in a 4-stroke engine without oil being on the cylinder walls while combustion occurs?
$endgroup$
– PhysicsGuy123
Apr 13 at 14:14
$begingroup$
Only the rings are in contact with the walls.. and as mentioned there is an oil film...
$endgroup$
– Solar Mike
Apr 13 at 15:15
add a comment |
$begingroup$
Simply because many small 2 strokes use the oil / fuel mix as the lubrication system as the lubrication occurs as the mix passes through the crankcase on its way to the combustion chamber.
A four stroke, and some 2 strokes, have a dedicated oil lubrication system with an oil reservoir, often in the sump, so the oil is not consumed with the fuel.
4 strokes do have a small amount of oil left on the bore as the piston descends because the scraper ring is not perfect while it does remove most of the oil film... But this is a really tiny amount.
answered Apr 13 at 13:41
Solar MikeSolar Mike
5,5861714
$endgroup$
Simply because many small 2 strokes use the oil / fuel mix as the lubrication system as the lubrication occurs as the mix passes through the crankcase on its way to the combustion chamber.
A four stroke, and some 2 strokes, have a dedicated oil lubrication system with an oil reservoir, often in the sump, so the oil is not consumed with the fuel.
4 strokes do have a small amount of oil left on the bore as the piston descends because the scraper ring is not perfect while it does remove most of the oil film... But this is a really tiny amount.
answered Apr 13 at 13:41
Solar MikeSolar Mike
5,5861714
answered Apr 13 at 13:41
Solar MikeSolar Mike
5,5861714
answered Apr 13 at 13:41
Solar MikeSolar Mike
5,5861714
answered Apr 13 at 13:41
Solar MikeSolar Mike
5,5861714
5,5861714
$begingroup$
Thanks for your answer. One question I do have is how the piston's movement within the cylinder is lubricated in a 4-stroke engine without oil being on the cylinder walls while combustion occurs?
$endgroup$
– PhysicsGuy123
Apr 13 at 14:14
$begingroup$
Only the rings are in contact with the walls.. and as mentioned there is an oil film...
$endgroup$
– Solar Mike
Apr 13 at 15:15
add a comment |
$begingroup$
Thanks for your answer. One question I do have is how the piston's movement within the cylinder is lubricated in a 4-stroke engine without oil being on the cylinder walls while combustion occurs?
$endgroup$
– PhysicsGuy123
Apr 13 at 14:14
$begingroup$
Only the rings are in contact with the walls.. and as mentioned there is an oil film...
$endgroup$
– Solar Mike
Apr 13 at 15:15
$begingroup$
Thanks for your answer. One question I do have is how the piston's movement within the cylinder is lubricated in a 4-stroke engine without oil being on the cylinder walls while combustion occurs?
$endgroup$
– PhysicsGuy123
Apr 13 at 14:14
$begingroup$
Thanks for your answer. One question I do have is how the piston's movement within the cylinder is lubricated in a 4-stroke engine without oil being on the cylinder walls while combustion occurs?
$endgroup$
– PhysicsGuy123
Apr 13 at 14:14
$begingroup$
Only the rings are in contact with the walls.. and as mentioned there is an oil film...
$endgroup$
– Solar Mike
Apr 13 at 15:15
$begingroup$
Only the rings are in contact with the walls.. and as mentioned there is an oil film...
$endgroup$
– Solar Mike
Apr 13 at 15:15
add a comment |
PhysicsGuy123 is a new contributor. Be nice, and check out our Code of Conduct.
PhysicsGuy123 is a new contributor. Be nice, and check out our Code of Conduct.
PhysicsGuy123 is a new contributor. Be nice, and check out our Code of Conduct.
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$begingroup$
An equivalent question might be to note that both engines need oil for lubrication but get it by different methods and then ask why the 2-stroke needs to have so much more oil added to the fuel than would normally be consumed by a 4-stroke. I.e. what would go wrong if only half the recommended amount of oil were mixed with the fuel?
$endgroup$
– Ray Butterworth
Apr 13 at 12:50